Improved performance of a simulated moving bed process by a recycling method in the partial - discard strategy / Kyung Min Kim in Industrial & engineering chemistry research, Vol. 51 N° 29 (Juillet 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 29 (Juillet 2012) . - pp. 9835-9849 Titre : Improved performance of a simulated moving bed process by a recycling method in the partial - discard strategy Type de document : texte imprimé Auteurs : Kyung Min Kim, Auteur ; Hyeon-Hui Lee, Auteur ; Chang-Ha Lee, Auteur Année de publication : 2012 Article en page(s) : pp. 9835-9849 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Recycling Simulated moving bed Résumé : The recycling partial-discard (RPD) strategy was developed to improve the performance of simulated moving bed (SMB) chromatography in partial-discard (PD) strategy by a simulation study. In the RPD operation, each discarded product portion of extract and raffinate is recycled as part of the feed. This strategy was applied to a binary mixture with a nonlinear isotherm in a four-zone SMB with two columns per zone. The two additional operating variables, recycle length (RL) and recycle flowrate (RF), were suggested for the RPD strategy in order to determine the time duration and flowrate of the recycle feed. Compared to those of the PD operation, extract and raffinate with higher purities can be produced from the RPD operation. Simultaneously, the losses in the other performance parameters (recovery, productivity, and eluent consumption) stemming from the PD operation could be favorably reduced by controlling the recycle length and recycle ratio in the RPD operation. The two variables, RL and RF, in the RPD operation played key roles in the improvement and trade-off of SMB performance parameters (purity, recovery, productivity, and eluent consumption). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26184962 [article] Improved performance of a simulated moving bed process by a recycling method in the partial - discard strategy [texte imprimé] / Kyung Min Kim, Auteur ; Hyeon-Hui Lee, Auteur ; Chang-Ha Lee, Auteur . - 2012 . - pp. 9835-9849. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 29 (Juillet 2012) . - pp. 9835-9849 Mots-clés : Recycling Simulated moving bed Résumé : The recycling partial-discard (RPD) strategy was developed to improve the performance of simulated moving bed (SMB) chromatography in partial-discard (PD) strategy by a simulation study. In the RPD operation, each discarded product portion of extract and raffinate is recycled as part of the feed. This strategy was applied to a binary mixture with a nonlinear isotherm in a four-zone SMB with two columns per zone. The two additional operating variables, recycle length (RL) and recycle flowrate (RF), were suggested for the RPD strategy in order to determine the time duration and flowrate of the recycle feed. Compared to those of the PD operation, extract and raffinate with higher purities can be produced from the RPD operation. Simultaneously, the losses in the other performance parameters (recovery, productivity, and eluent consumption) stemming from the PD operation could be favorably reduced by controlling the recycle length and recycle ratio in the RPD operation. The two variables, RL and RF, in the RPD operation played key roles in the improvement and trade-off of SMB performance parameters (purity, recovery, productivity, and eluent consumption). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26184962

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Local heat/mass transfer and friction loss measurement in a rotating matrix cooling channel / In Taek Oh in Journal of heat transfer, Vol. 134 N° 1 (Janvier 2012)  

Public ISBD [article]  inJournal of heat transfer > Vol. 134 N° 1 (Janvier 2012) . - 09 p. Titre : Local heat/mass transfer and friction loss measurement in a rotating matrix cooling channel Type de document : texte imprimé Auteurs : In Taek Oh, Auteur ; Kyung Min Kim, Auteur ; Dong Hyun Lee, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : Heat transfer Langues : Anglais (eng) Mots-clés : Channel flow Gas turbines Heat transfer Mass Rotational Swirling Turbulence Index. décimale : 536 Chaleur. Thermodynamique Résumé : The present investigation provides detailed local heat/mass transfer and pressure drop characteristics in a matrix cooling channel, under rotating conditions. The matrix channel had cooling subpassages with crossing angles of 45 deg. The detailed heat/mass transfer coefficients were measured via the naphthalene sublimation method, and pressure drops were also obtained. The experiments were conducted for various Reynolds numbers (10,500 to 44,000) and rotation numbers (0.0 to 0.8). In the stationary case, the heat transfer characteristics were dominated by turning, impinging, and swirling flow, induced by the matrix channel geometry. Average heat/mass transfer coefficients on the leading and trailing surfaces in the stationary channel were approximately 2.1 times greater than those in a smooth channel. In the rotating cases, the effect of rotation on heat/mass transfer characteristics differed from that of typical rotating channels with radially outward flow. As the rotation number increased, the Sherwood number ratios increased on the leading surfaces but changed only slightly on the trailing surfaces. The thermal performance factors increased with rotation number due to the increased Sherwood number ratios and decreased friction factor ratios. DEWEY : 536 ISSN : 0022-1481 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013400 [...] [article] Local heat/mass transfer and friction loss measurement in a rotating matrix cooling channel [texte imprimé] / In Taek Oh, Auteur ; Kyung Min Kim, Auteur ; Dong Hyun Lee, Auteur . - 2012 . - 09 p. Heat transfer Langues : Anglais (eng) in Journal of heat transfer > Vol. 134 N° 1 (Janvier 2012) . - 09 p. Mots-clés : Channel flow Gas turbines Heat transfer Mass Rotational Swirling Turbulence Index. décimale : 536 Chaleur. Thermodynamique Résumé : The present investigation provides detailed local heat/mass transfer and pressure drop characteristics in a matrix cooling channel, under rotating conditions. The matrix channel had cooling subpassages with crossing angles of 45 deg. The detailed heat/mass transfer coefficients were measured via the naphthalene sublimation method, and pressure drops were also obtained. The experiments were conducted for various Reynolds numbers (10,500 to 44,000) and rotation numbers (0.0 to 0.8). In the stationary case, the heat transfer characteristics were dominated by turning, impinging, and swirling flow, induced by the matrix channel geometry. Average heat/mass transfer coefficients on the leading and trailing surfaces in the stationary channel were approximately 2.1 times greater than those in a smooth channel. In the rotating cases, the effect of rotation on heat/mass transfer characteristics differed from that of typical rotating channels with radially outward flow. As the rotation number increased, the Sherwood number ratios increased on the leading surfaces but changed only slightly on the trailing surfaces. The thermal performance factors increased with rotation number due to the increased Sherwood number ratios and decreased friction factor ratios. DEWEY : 536 ISSN : 0022-1481 En ligne : http://www.asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO00013400 [...]

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